error: Unable to load contents of file list: '/Users/xixi/abc/abc/Pods/Target Support Files/Pods-abc/Pods-abc-frameworks-Debug-output-files.xcfilelist' (in target 'abc')

解决：
一时手贱，升级了一下 cocoapods 的版本不同导致
重新安装或者升级一下就好

sudo gem install cocoapods --pre